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6,916
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Media Type
5,978
texts
516
audio
384
movies
21
images
10
data
3
concerts
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Topics & Subjects
2,598
ERIC Archive
2,386
NASA Technical Reports Server (NTRS)
1,872
Feedback
1,869
FEEDBACK CONTROL
853
Feedback (Response)
810
FEEDBACK
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Collection
2,598
Education Resources Information Center (ERIC) Archive
2,386
NASA Network Resource and Training Site
366
Community Audio
289
Community Video
258
NASA Technical Documents
235
The Magazine Rack
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Creator
2,598
eric
2,386
nasa technical reports server (ntrs)
213
huda tv
212
defense technical information center
33
keith hughes
27
non
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Language
6,268
English
3
German
2
Arabic
2
Urdu
1
Asturian
1
Dutch
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